Version:           1.13.5 (using KDE 4.5.90) 
OS:                Linux

Evertime I click (left mouse button) the system tray icon of kmail kontact quits.

I run kmail as part of kontact. If I click on th eakregator icon or if I open kmail from the module list (left bar in kontact) it works without problem. Also calling "kmail" in krunner works.

I get no crash message, but if I run kontact in a terminal I get:

kontact(12521)/kontact (core) Kontact::MainWindow::slotActivePartChanged: Part activated: KMailPart(0x9ede90) with stack id. 1
kontact(12521)/kdeui (kdelibs): Attempt to use QAction "" with KXMLGUIFactory! 
kontact(12521)/kdeui (kdelibs): Attempt to use QAction "" with KXMLGUIFactory! 
kontact(12521)/kdeui (kdelibs): Attempt to use QAction "" with KXMLGUIFactory! 

FAILURE (KCmdLineArgs):
Application requests for isSet("module") but the "module" option
has never been specified via addCmdLineOptions( ... )

PS: I have KDE 4.6 RC2 but this is not in the list above.

Reproducible: Always

Steps to Reproduce:
Start kontact -> close the window -> reopen the windown clicking on the kmail icon

Actual Results:  
kontact quits

Expected Results:  
show the window (kmail part)